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No. 345,564. Patented July 13, 1886.

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No. 345,564. Patented July 13, 1886.

* UNITED STATES PATENT OFFICE,

CHARLES R. ALSCP, OF SYRACUSE, NEW YORK.

HOT-AIR FURNACE.

a'lECIPICATION forming part. of Letters Patent No. 345,564, dated July13, 1886.

' Application filed January 4, 1886. Serial No. 187,582. (No model.)

To all whom it may concern:

Be itknown that I, CHARLES R. ALSOP, of Syracuse, in the countyofOnondaga, in the State of New York, have invented new and usefulImprovements in Hot-Air Furnaces, of which the-following, taken inconnection with the accompanying drawings, is a full, clear, and exactdescription.

This invention consists in an improved combination, With the fire-potand combustionchamber, of an annular radiator surrounding the fire-potand combustion-chamber and an annular smoke-jacket surrounding saidradiator, with intervening annular vertical airpassages communicatingwith each other alternately at their upper and lower ends, whereby theair which circulates through the said passages is caused toeffectuallyimpinge those parts of the furnacethrough which the productsof combustion pass, and thus said air becomes thoroughly heated by aminimum consumption of fuel; and the invention also consists in thecombination, with the combustion-chamber and a hot-air passage above thesame, of a magazine extending through the said air-passage, a coverremovably connected to the lower end of said magazine,-ports in theupper part of the magazine communicating with the aforesaid air-passage,and a stopper applied removably to said ports, by which arrangement saidmagazine can be converted into an air-heating chamber, all constructedand combined in the manner hereinafter more fully described, andspecifically set forth in the claims.

In the annexed drawings, Figure 1 is a vertical section of my improvedhot-air furnace;

and Figs. 2, 3, and 4 are horizontal transverse sections, respectively,on the lines as x, y y, and z 2, Fig. 1.

Similar letters of reference indicate corresponding parts. p

A denotes the fire-pot;- Ii, the subjacent ashpit, and B thecombustion-chamber mounted on the fire-potin any suitable and well-knownmanner.

N represents the chute, through which to introduce the fuel at the sideof the furnace, and e is thewatcr-pan arranged in the airpassageextending across the under side of the chute inthe usual manner.

The upper-end of the combustion-chamber B terminates in an annularradiator, C, which is extended horizontally or laterally outwardtherefrom and concentric therewith. From the peripheral portion of theradiator C is ex-v tended downward an annular vertical radiator, D,which surrounds the combustionchamber and fire-pot, with an annularspace between them, and around the exterior of the radiator D isarranged an annular vertical smoke-jacket, E, which is of acircumference to form an annular space, 3, between them,

and reaches below and above said radiator,

and by the horizontal annular plate f extending from the bottom of thesmoke-jacket to the fire-pot, a horizontal annular air-passage, 4, isformed under the bottom of the radiator D. The smoke-jacket Ecommunicates with the radiator D by flues g g at the base thereof. Theupper end of the smoke-jacket terminates with a horizontal annularinward extension, E, to which the exit-flue F is connected. F representsthe direct draft exit-flue, whic taps the radiator C, and is providedwith a damper, 71. By closing said damper the'products of combustion arecompelled to take the circuitous or tortuous passage from the radi ator0 down through the radiator D, thence to the base of the smoke-jacket E,thence up in the latter, and out throught the exit-flue F, as shown byfull-lined arrows in Fig. l of the drawings, thereby retarding theescape of heat through said exit-flue, and causing the aforesaidradiators and smoke-jacket to become thoroughly heated. In the spacebetween the combustion-chamberB and radiator D, I erect from thebefore-described bottom plate, f, an annular vertical partition, 02,extending part way the height of said space and dividing the same intotwo annular vertical air-passages, 1 and 2, which communicate with eachother at their upper ends. That portion of the plate f which extendsacross the bottom of the air-passage l is provided with apertures a forinlets of cold air for the cold-air chamber P to the passage 1. The coldair may be admitted to the chamber P either by apertures in the side ofsaid chamber or by apipe, 0, extended to the outside of the building.The air-passage 2 intersects at its base the horizontal annularair-passage 4,hereinbefore described, and thereby communicates with theannular vertical air passage 3, formed by the space between the radiatorD and smokejacket E. By an annular horizontal plate, 6, above theradiator O, and joined to the upper edge of the inner shell of thesmoke-jacket E, a horizontal annular air-passage, 5, is formed acrossthe top of the radiator O, and made to communicate with the air-passage3 at the upper end thereof.

H H represent the hotair pipes,which are extended from the air-passage 5to the apartments to be heated. The outer shell of the smoke-jacket isprovided with apertures directly in front of the outer ends of the duesg g, and over said apertures are placed removable covers Z. By removingsaid covers access can be had to the interior of the smokejacket E andradiator D for cleaning the same.

The operation of my improved hot-air furnace is as follows: In startingthe fire in the furnace, the damper h is to be turned to open the directexit-flue F, and thus increase the draft through the fire-pot andcombustionchamber. After the fire is well under way the aforesaid damperis to be closed to cause the products of combustion to pass successivelythrough the radiators and smokejacket G D E and out through theexit-pipe F,as represented by full-lined arrows in Fig. 1 of thedrawings, in the manner hereinbefore described. In the meantime the coldair passes from the chamber P at the base of the furnace up through thepassage 1, thence down through the passage 2,thence outward through thepassage 4, thence up through the passage 3 and into the passage 5 at thetop of the furnace. During the described circulation the air is broughtinto intimate contact with the heated sides and ends of the aforesaidcombustion-chamber, radiators, and smoke-jacket, and is thereby causedto effectually absorb the heat therefrom, so that the escape of heatthrough the exittlue F is reduced to a minimum. The air thus thoroughlyhcaed is concentrated in the upper passage, 5, which is extended acrossthe top of the combustionchamber and first horizontal radiator, G, andthe bottom of said air-passage 5 is thus effectually impinged by theproducts of combustion. The air which circulates through the saidpassage is therefore subjected to the most intense heat before itescapes to the ducts or pipes H H,which convey said air to theapartments to be supplied with heat.

I represents a fuel-magazine, which is extended through the upperairpassage, 5, down into the combustion-chamber B the usual distance todeliver the fuel to the fire-pot A. That portion of the magazine whichis inclosed in the air-passage 5, I provide with ports 0 c, by which themagazine communicates with the aforesaid air-passage, and over saidports I arrange removable stoppers, by which said ports can be closed toprevent gases from passing from the magazine into the air-passage. Saidstoppers are here represented in the form of a short cylinder slippedinside of the upper end of. the magazine, as shown in Fig. 1 ofthedrawings. To the lower end of the magazine I fit removably a cover, b.By applying said cover to the magazine, as represented by dotted linesin Fig. 1 of the drawings, and removing the stoppers d from the ports a,I convert said magazine into a hot-air chamber communicating withthehot' air passage 5.

t It will be observed that in my improved hot-air furnacethesmoke-jacket E constitutes the casing which incloses the furnace andforms a warm envelope for the same; but, if desired, an additionalcasing may be placed around the described furnace.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is-- 1. A hot-air furnace comprising a fire-pot,subjacent ash-pit, and superposed combustionchamber, all arrangedcentral of the furnace, a radiator surrounding the firepot andcombustion-chamber and communicating with the latter at the upper endthereof, asmoke-jacket surrounding the aforesaid radiator andcommunicating with the bottom portion thereof, an exitfiue connected tosaid jacket, two airpassages extending around the space between theradiator and combustion-chamberand firepot, the air-passage adjacent tothe latter being provided with air-inlets at the base and connected withthe other air-passage at the top, a third air-passage between theradiator and smoke-jacket and extending around the same andcommunicating with the second airpassage at the base thereof, anair-passage extending across the top of the'furnace and communicatingwith the third air passage, and hot-air pipes extending from the topair-passage, all combined to operate substantially as set forth.

2. In combination with the fire-pot A and combustion-chamber B, theannular radiator 0, extended horizontally or laterally outward from theupper end of the combustion-chamber, the radiator D, extending downwardfrom the peripheral portion of the radiator C and surrounding thecombustion-chamber and firepot, the smoke-jacket E, surrounding theradiator D and communicating with the same at the base thereof, theexit-flue F, connected with the smoke-jacket E, the annular verticalairpassage 1, adjacent to the fire-pot and combustion chamber andprovided with cold-air inlets a, the annular vertical air-passage 2,between the passage 1 and radiator D and communicating with the passage1 at the upper end, the annular vertical air passage 3, between theradiatorD and jacketE, theannular horizontal air-passage 4, under theradiator D and connecting the passages 2 and 3, and the annularhorizontal air passage 5, extended across the top of the radiator O andconnected with the passage 3 and hot-air pipesH, ex- In testimonywhereof I have hereunto signed tended from the passage 5, substantiallyas my name and affixed my seal, in the presence described and shown. oftwo attesting Witnesses, at Syracuse, in the 3. The combination, withthe combustioncounty of Onondaga and State of New York, 15 5 chamber, ofa magazine projecting above said this 2d day of January, 1886.

combustion-chamber and provided thereat with ports communicating withthe open air, CHARLES R. ALSOP. [L s.] stoppers removably applied tosaid ports, and p 7 removable covers, respectively on top and Witnesses:10 bottom of the magazine, substantially as and FREDERICK H. GIBBS,

for the purpose set forth. O. BENDIXON.

